navy frequently uses in the persian gulf. abc news saw them launched off a ship recently in the gulf. they're small, about ten feet wide and unarmed. but the navy says adamantly they are not missing any u.s. drones currently operating in the gulf. although, they have lost them in the water in the past. the iranians could have found one of those or could have found one from another country. important to note, that even if the iranians have one, the scan eagle is nothing like the cia stealth drone that crashed in iran last year around this time. that, josh, was a huge loss of secret technology. but the tensions do remain with iran. >> martha raddatz, there in washington. thank you for that. >>> now, to the other crisis capturing the world's attention. new concerns that syria may be preparing to use chemical weapons against rebels, trying to overthrow the country's government. today, neighboring turkey, is asking nato for patriot missiles to defend itself as a precaution. president obama has warned syria the u.s. will respond if